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untimbered tunnel meaning in English

无坑木支撑的隧道
无支撑隧道

Related Words

  1. untimbered
  2. untimbered rill
  3. untimbered rill stoping
  4. untimbered rill method
  5. tunnel correction
  6. undersea tunnel
  7. grade tunnel
  8. tunnel form
  9. medium tunnel
  10. tunneling effect
  11. untimbered rill method
  12. untimbered rill stoping
  13. untime
  14. untimed
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